Dyno tuned and tested against the competition for maximum performance CAD-rendered, race-inspired 4-into-1 design emphasizes top-end power for road racing applications 50 state legal or pending legality Available in 100% 304 polished stainless steel (including flanges), or mild steel with ceramic coating CNC mandrel bends with robotically welded fittings deliver perfect fit Equal length primary piping ensures optimum tuning for more power across rpm range Unique merge collector design ensures smooth exhaust gas flow Comprehensive installation instructions, all necessary hardware and decals included